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Zr-in-rutile thermometry in eclogite at Jinheqiao in the Dabie orogen and its geochemical implications

Chinese Science Bulletin 2008年第5期53卷 768-776页

作者： CHEN ZhenYu LI QiuLi Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

Trace element analysis was made by an electron microprobe on rutiles from ultrahigh-pressure ec-logite at Jinheqiao in the Dabie orogen. The results show Zr contents of 37 to 118 μg·g?1, with signifi-cant variations between grains within the same thin section. Zr-in-rutile temperatures were calculated by the pressure-dependent thermometer, yielding 595 to 678℃ at 4.1 GPa for the upper limit of meta-morphic pressures. The temperatures are about 200 to 250℃ lower than temperatures of 846±70℃ calculated from garnet-omphacite Fe-Mg partition geothermometry, but 150 to 200℃ higher than ~460℃ from quartz-rutile O isotope temperatures and rutile Pb diffusion closure temperature for the same specimen. This indicates that the diffusion rate of Zr in rutile is remarkably slower than that of Pb and O in rutile, and that the temperature of Zr-in-rutile is higher than the closure temperature corre-sponding to cooling age as dated by rutile U-Pb radiometric system. The latter is consistent with ex-perimental result of Zr diffusion in rutile. Diffusion and re-crystallization with intensive retrograde fluid during exhumation of UHP metamorphic rocks may be the major reason why the Zr contents in rutile decreased and thus did not provide the record of the peak metamorphic temperatures. The remarkable difference in Zr content between rutile grains suggests that the distribution of Zr in rutile was in the state of disequilibrium due to differential diffusion and retrograde resetting.

关键词：地球化学大白造山带金红石温度测定榴辉岩地质年代测定

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